I was reading the first 150 pages and Lordy what a mess. Just makes these headphones all the more amazing. They came out under all kinds of faux pre release problems according to some very reliable posters. Many didn't care for them and felt them too bright, soundstaging had a hole in the middle, bass shy, not worth having if a mid fi headphone amp couldn't suffice. When the speaker amps were introduced, comparisons to stats and LCD bass differences catapulted the 6s to a lofty status. HiFiMan took some heat and certainly proved themselves worthy of praise. But I still think they should have included a speaker amp adapter with every pair as first advertised instead of claiming a quality headphone amp was fine. They even stopped selling any speaker amp adapters. What a sleeping giant that never would have been discovered if we stuck with the company line. But it was the Dr. himself digging a Threshold out for introductions. Quite a storied beginning and continues to shine against the onslaught of it's detractors.